24 



The Vegetation of the 



The mean of the year is at 7 a. m., 81; at 2 p. m., 58; at 9 p. m., 75. 

 The highest mean in January at 7 a. m., is 89; the lowest in May, 2 p. m., 

 50. 



The pressure of vapor is the highest in July, 9 p. m., 0.669 of an inch, 

 the lowest in January, 7 a. m., 0.114. 



The means for the year are: 0.316 at 7 a. m.; 0.338 at 2 p. m., and 

 0.340 at 9 p. M. 



Table 5. 



PRECIPITATION, HUMIDITY OF ATMOSPHERE, AND 



PRESSURE OF YAPOR. 



Decembei: . 

 January .. 

 February . 



March 



April 



May 



June 



July 



August . . . 

 September . 

 October . . . 

 November 



Winter , 

 Spring.. 

 Summer 

 Fall 



Year 



MEAN PRECIP- 

 ITATION- 



Inches I^ *iay« 



2.48 

 1.61 

 2.04 

 2.68 

 .3.17 

 3.80 

 4.03 

 4.04 

 3.16 

 3.49 

 2.71 

 2.37 



6.13 



9.65 



11.23 



8.57 



35.58 



10 



10 



10 



9 



7 

 8 



7 

 7 



23 

 29 

 26 

 23 



100 



RELATIVE HUMIDITY 



OF THE 



ATMO.SPHERE. 



7 a.m. 2 p.m. 9 p.m. 



87 

 89 

 87 

 80 

 75 

 73 

 77 

 78 

 81 

 83 

 83 

 81 



76 

 79 



82 



81 



70 

 71 

 66 

 59 

 52 

 50 

 53 

 53 

 52 

 55 

 55 

 63 



69 

 54 

 53 



58 



58 



80 

 81 

 80 

 74 

 70 

 70 

 74 

 74 

 75 

 76 

 75 

 75 



80 

 71 



74 

 75 



75 



PRESSURE OF VAPOR 



IN FRACTIONS 



OF INCHES. 



7 A.M. 2 P.M.. 9 P.M. 



.130 



.114 

 .122 

 .157 

 .240 

 .362 

 .537 

 .626 

 .590 

 .465 

 .276 

 .173 



.122 

 .253 

 .548 

 .305 



.316 



.142 

 .130 

 .145 

 .185 

 .260 

 .390 

 .559 

 .642 

 ,610 

 .500 

 .299 

 .193 



.139 



.278 

 .604 

 .331 



.338 



.134 

 .122 

 .138 

 .177 

 .263 

 .397 

 .567 

 .669 

 .642 

 .492 

 .291 

 .185 



.131 

 .279 

 .626 

 .323 



.340 



CLOUDINESS AND SUNSHINE. 



The cloudiness of the sky is expressed by figures, which mean the 

 percentage of covering, 100 was noted, when the sky was entirely covered, 

 50 when half, and so on, and when cloudless. The sky is the most cov- 

 ered in December in the morning, and least in August in the evening. 



The mean for the year is 47; the highest for the month is in Decem- 

 ber, 55; the lowest August, 35. 



From the amount of cloudliness cannot be deduced the time of sun- 

 shine duriug a period, for the sky may be half covered, the sun may shine 

 during the whole day. It is necessary to note the time of sunshine every 

 day. This was done from December 1857 to November 1868 and the re- 

 sult was that we had sunshine 58 p. c. of the time from sunrise to sunset. 



The sunniest months are June and August each with 71 p. c. 



